I just ordered a couple of skulls from the American Science & Surplus catalog web site. They have weird (often useless) and offbeat things, including the skulls I ordered. At $12.50 a pop, they sound pretty reasonable. I'm curious to see how good they look. The website also has a full-sized skeleton for $299.
The item number for the skulls is 91799 and for the full skeleton it is 88824. I would so love to have one of those skeletons. 
http://www.sciplus.com/
Tags: Props